近日，中国科学院广州地球化学研究所王煜团队报道了辉长石介导的从俯冲带到深部地幔的氟和氯通量。该研究于2026年4月3日发表在《科学-进展》杂志上。
挥发分通过俯冲带的循环深刻塑造了地球的化学演化，然而氟（F）和氯（Cl）在地幔深处的行为机制仍不清楚。
研究组利用蚀变洋壳类似物开展高压实验（压力5–11吉帕、温度850–1200°C），追踪卤素的深部行为。结果显示，多硅白云母在11吉帕、1050°C条件下仍保持稳定，可有效将F和Cl输送至约330公里深度。在分解或熔融过程中，多硅白云母强烈分异这两种卤素：Cl释放进入流体或熔体，而F则被固定在残余相（如KMgF3）中。
所产生的富Cl流体（Cl含量9.6–19.9 wt%）与钻石中的高密度流体包裹体高度吻合，表明它们是克拉通交代作用的关键介质。该研究确立了多硅白云母作为关键载体，调控着弧后F通量（每年1.7×1012–2.6×1012克）和Cl通量（每年0.52×1012–1.1×1012克），为深部地幔卤素储库的补充提供了主要路径。
附：英文原文
Title: Phengite-mediated fluorine and chlorine fluxes from subduction zones to the deep mantle
Author: Yingzhuo Liu, Yu Wang, Chunfei Chen, Mingdi Gao, Yi-Gang Xu
Issue&Volume: 2026-04-03
Abstract: The cycling of volatiles through subduction zones fundamentally shapes Earth’s chemical evolution, yet how fluorine (F) and chlorine (Cl) are processed in the deep mantle remains enigmatic. Here, we use high-pressure experiments (5 to 11 gigapascals and 850° to 1200°C) on altered oceanic crust analogs to track deep halogen behavior. We show that phengite remains stable to 11 gigapascals and 1050°C, efficiently transporting F and Cl to ~330-kilometer depth. Upon breakdown or melting, phengite strongly fractionates these halogens: Cl is released into fluids or melts, while F is sequestered in residual phases such as KMgF3. The Cl-rich fluids produced (9.6 to 19.9 wt % Cl) closely match high-density fluid inclusions in diamonds, implicating them as key agents of cratonic metasomatism. Our findings establish phengite as a critical carrier mediating postarc fluxes of F (1.7 × 1012 to 2.6 × 1012 grams per year) and Cl (0.52 × 1012 to 1.1 × 1012 grams per year), providing a major pathway for replenishing deep mantle halogen reservoirs.
DOI: aee6110
Source: https://www.science.org/doi/10.1126/sciadv.aee6110